Securing device for tappets.



J. E. REAVES & G. M. BANDY.

SECURING DEVICE FOR TAPPETS.

APPLICATION FILED JUNE 7,1913.

L1$561 a Patented (12111.12, 1915.

WITNESSES: w a MM STATES PATENT QFFIGE.

JOH EDWARD nE'avns amp cLnunn Manon nanny, or sncnemnmo, CALIFORNIA.

SEQURING FOR TAPPETS.

Specification of Letters l atent.

Patented J an 12], 1915 To all whom it may concern:

Be it known that we, JOHN E. REAVES, and CLAUDE M. Balsnr, citizens of the United States, residing at Sacramento, in the county of Sacramento and State of- California, have invented certainnew and useful Improvements in Securing Devices for Tappets, of which the followin is a specification.

The hereinafter escri bed invention'relates to certain new'and useful means'for locking the tappet in adjusted positionrelative to the stamp stem of a stamp {mill and hold the same in such locked position and aga'inst displacement relative to thes'tamp'stem dur-' ing operation of the stamp milL the construction and operation of the locking means being such as to permit of the tappet being readily released 'from the 'stanipstein to vary the position thereto in accordance with the wear action of the stamp head the "object of the invention being to prevent the slippage of the tappet "on the stamp stem under 'the influence of the impact "strains to which it issubicted during the operation of thestar n'p "mill, while at the same time providing a simple, efl'ectiveand' durable form of locking means which will do away with driving keys ordinarily employed for looking the tappet to the stampstem, and allow of the tappet being quickly released from the stamp stem for purpose ofadjust ment.

To' comprehend the invention, reference should be had tothe accompanying sheet of drawings, wherein Figure 1 is 'a'broken view in elevation of a stamp stem with the tappetapplied' thereto, illustrating the tappet cam for raising the stamp stem through the medium of the tappet. Fig. 2 is a vertical "sectional View of the tappet, disclosing the means for holding the same locked to the stamp stem. Fig.

3 is a cross sectional top plan view taken on line w-w, 2 of the drawings.

In the drawings, the numeral 1 is used to designate a stamp stem provided with the usual stamp head 2. to which stem the tappet 3 is secured by the hereinafter described locking means. The tappet is acted on by the ordinary tappet cam 4 for raising the stamp head 2, as usual in connection with stamp mills. the said cam being mounted on the cam shaft 5. Within the tappet is provided a vertically disposed countersunk seat 6, which communicates with the central bore 7 of the tappet, and in saidseat is fitted a g'ib 8. The outer face ofthe-gib 8 is shaped to conform to the surface of the stamp stem 1 which it frictionally engages, and on the inner'f ace of, the said gib'the inclines 9 and 9" are formed. These inclines 'a"re"engaged by the inclined wedges or looking keys l0 and 10, which fit within the'transverse key seats 11 and 12 formedin'the tappet 3 Figs. 2 and 3 of the drawings Thfse keys 10 and l0 serve to wedge the gib'8'in position and hold the same and the tappet 3'securely to the stamp stem 1, it being'obvious that the farther the saidkeys are driven into the key seats, the firmer will become,

through the tightening or wedging of the gib '8,"the locked union of the'tappet 3 to stamp stem 1. f

aseeu a the e to the ta p em the gib '8 is first placed into its'jseat 6 within the tappet 3. and'the tappet then fitted onto the stamp stem until properly positioned relative'to the tappet am 4. The keys 10 and 10" are then fit'ted respectively into the transverse seats1112,

tion of'the stamp the blow oflthe cam 4 against the under face of the'tappet forces the said tappet'upwardly, causingthe gib to tighten against thestamp stem by reason of the keyslO andIO acting against theincl1nes9 and 9f, which wedges the sai'dgib firmly against the stamp stem, and byso doing holding the tappet securely locked thereto. As thus locked, it is obvious that during operation of the stamp mill the impact'blow or strainimparted or transmitted to the tappet and tending to move the same upwardly on the stamp stem, tends to increase the wedging action of the gib 8 relative to the stamp stem and by so tighten-- ing the tappet relative to the stamp stem .and thus increasing the friction union between the said parts. I

Where it is desired to release the tappet for purpose of adjustment, it only required to strike a blow downward on the tappet with a hammer, in order to loosen the gib '8', when the tappet is free to be moved up and down on the stamp stem to adjust the same to any desired position, whichadjustment is required to regulate the'throw of the stamp stem in accordance with, the wear of the stamp head.

While .we have illustrated and described the preferred. form of frictional locking means for adjusting and holding the tappet locked relative to the stamp stem, we do not when during operastruction as to the cooperating working-- arts. p Having thus described the inventlon what we claim asnew and desire to protect by Letters Patent is z- 1. A means for securing a tubular memher to a shaft, the same including a tubular member through which the shaft passes, said member being provided with an internal seat and transversely disposedkey Ways, a clamping member loosely fitted within the internal seat of the tubular member and pro vided on its rear face with transversely extending key seats, the faceof both of said seats being beveled in a corresponding direction and toward'one end ofsaid clamping member, and wedge shaped keys formed with a' transversely beveled and longitudinally extending front face and'movable within the key ways of the tubular member for engagement with the beveled key seats of the clamping member for forcing the same into frictional engagement with the shaft to lock the tubular member thereto.

2. A means for securing a tubular member to a shaft, the same including a tubular member through which .the shaft passes, said member being provided with an internal seat and transversely disposed key Ways having a longitudinally inclined rear wall, a clamping member loosely fitted within said internal seat and provided on its rear face with key seats, the rear faces of both of which are beveled in a direction toward one end of said clamping member, and tapering keys formed with a substantially fiat rear face for contact with the inclined rear wall of said key ways and formed for their full length with a transversely beveled 1ongitudinally inclined front face, for cooperation with said beveled key seats in the clamping member for forcing the clamping member into frictional engagement with the 

